<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--视口标签：规定html的尺寸，让html宽度=逻辑分辨率宽度或设备宽度-->
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>

</body>
</html>